[sheepdog] [PATCH] logger: add date and time to log messages even if an output is stdout

[Hitoshi Mitake]

From: Hitoshi Mitake <h.mitake at gmail.com>

This patch makes logger to add date and time to log messages even if
an output is stdout. It can be useful for debugging.

Signed-off-by: Hitoshi Mitake <mitake.hitoshi at lab.ntt.co.jp>
---
 lib/logger.c |   23 +++++++++++++++++++++++
 1 files changed, 23 insertions(+), 0 deletions(-)

diff --git a/lib/logger.c b/lib/logger.c
index 094b453..8511ac9 100644
--- a/lib/logger.c
+++ b/lib/logger.c
@@ -150,12 +150,35 @@ static void notrace free_logarea(void)
 	shmdt(la);
 }
 
+static const char *month(int m)
+{
+	const char *s[] = {
+		"Jan", "Feb", "Mar", "Apr", "May", "Jun",
+		"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
+	};
+
+	if (!(1 <= m && m <= 12))
+		return "Invalid month";
+
+	return s[m - 1];
+}
+
 static notrace int log_vsnprintf(char *buff, size_t size, int prio,
 				 const char *func, int line, const char *fmt,
 				 va_list ap)
 {
 	char *p = buff;
 
+	if (!la) {
+		time_t t = time(NULL);
+		struct tm tm;
+		gmtime_r(&t, &tm);
+
+		snprintf(p, size, "%s %02d %02d:%02d:%02d ", month(tm.tm_mon),
+			tm.tm_mday, tm.tm_hour, tm.tm_min, tm.tm_sec);
+		p += strlen(p);
+	}
+
 	if (worker_name && worker_idx)
 		snprintf(p, size, "[%s %d] ", worker_name, worker_idx);
 	else if (worker_name)
-- 
1.7.2.5